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US Patent: 160,981
Improvement in Monkey-Wrenches
Joe L. Whipple - Paw Paw, MI

USPTO Classifications:
81/137, 81/170

Tool Categories:
wrenches : nut wrenches

Chandler W. Whipple - Paw Paw, MI
Joe L. Whipple - Paw Paw, MI

Not known to have been produced

Edward Barthel
James O'Brin
Charles E. Galligan
Charles P. Galligan

Patent Dates:
Applied: Nov. 17, 1874
Granted: Mar. 16, 1875

Patent Pictures:
Joe L. Whipple Pat. March 16, 1875
USPTO pdf tiff
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The adjustment on the movable jaw is a screw with two "disks" that engage rack teeth on the main bar. The disks are cut away on one side to allow free movement, and the thread pitch on the screw is coordinated with the rack teeth spacing to allow for adjustment to any size of nut that will fit between the jaws. This is a fairly simple means to obtain a combination quick and screw-adjust nut wrench.

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